﻿<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=no">
<title>js侧滑显示删除按钮</title>
<style>
*{margin:0;padding:0;}
body{font-size:.14rem;}
li{list-style:none;}
i{font-style:normal;}
a{color:#393939;text-decoration:none;}
.list{overflow:hidden;margin-top:.2rem;padding-left:.3rem;border-top:1px solid #ddd;}
.list li{overflow:hidden;width:120%;border-bottom:1px solid #ddd;}
.list li a{display:block;height:.88rem;line-height:.88rem;-webkit-transition:all 0.3s linear;transition:all 0.3s linear;}
.list li i{float:right;width:15%;text-align:center;background:#E2421B;color:#fff;}
.swipeleft{transform:translateX(-15%);-webkit-transform:translateX(-15%);}
</style>
<script>
//计算根节点HTML的字体大小
function resizeRoot(){
    var deviceWidth = document.documentElement.clientWidth,
        num = 750,
        num1 = num / 100;
    if(deviceWidth > num){
        deviceWidth = num;  
    }
    document.documentElement.style.fontSize = deviceWidth / num1 + "px";
}
//根节点HTML的字体大小初始化
resizeRoot();

window.onresize = function(){
    resizeRoot();
};
</script>
</head>
<body>
<section>
<div class="list">
    <ul>
        <li><a href="#">侧滑显示删除按钮1<i>删除</i></a></li>
        <li><a href="#">侧滑显示删除按钮2<i>删除</i></a></li>
        <li><a href="#">侧滑显示删除按钮3<i>删除</i></a></li>
    </ul>
</div>
<script>
//侧滑显示删除按钮
var expansion = null; //是否存在展开的list
var container = document.querySelectorAll('.list li a');
for(var i = 0; i < container.length; i++){    
    var x, y, X, Y, swipeX, swipeY;
    container[i].addEventListener('touchstart', function(event) {
        x = event.changedTouches[0].pageX;
        y = event.changedTouches[0].pageY;
        swipeX = true;
        swipeY = true ;
        if(expansion){   //判断是否展开，如果展开则收起
            expansion.className = "";
        }        
    });
    container[i].addEventListener('touchmove', function(event){
        
        X = event.changedTouches[0].pageX;
        Y = event.changedTouches[0].pageY;        
        // 左右滑动
        if(swipeX && Math.abs(X - x) - Math.abs(Y - y) > 0){
            // 阻止事件冒泡
            event.stopPropagation();
            if(X - x > 10){   //右滑
                event.preventDefault();
                this.className = "";    //右滑收起
            }
            if(x - X > 10){   //左滑
                event.preventDefault();
                this.className = "swipeleft";   //左滑展开
                expansion = this;
            }
            swipeY = false;
        }
        // 上下滑动
        if(swipeY && Math.abs(X - x) - Math.abs(Y - y) < 0) {
            swipeX = false;
        }        
    });
}
</script>
</body>
</html>